In a blast furnace, coke, which is solid carbon, reacts with O2(g) to form carbon monoxide. The carbon monoxide then reacts with Fe2O3(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?
A) 2 Fe2O3(s) + 3 C(s) + 3 O2(g) ? 2 Fe(s) + 3 CO2(g)
B) 2 Fe2O3(s) + 2 C(s) + 3 O2(g) ? 4 Fe(s) + 2 CO2(g)
C) 2 Fe2O3(s) + 6 C(s) + 3 O2(g) ? 4 Fe(s) + 6 CO2(g)
D) 2 Fe2O3(s) + C(s) + 3 O2(g) ? Fe(s) + CO2(g)
C
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The Aral sea disaster led to which one of the following?
A. salinization, fish and wildlife kills, and human health problems B. fish and wildlife kills, increased crop yields, and human health problems C. human health problems, increased irrigation projects, and increased water pollutants D. increased crop yields, fish and wildlife kills, and decreased pesticide use E. decreased pesticide use, increased water pollutants, and salinization
How many joules are in 1 kilocalorie?
A. 1054. B. 4190. C. 41.9. D. 4.19.
In what type of metamorphism does this reaction occur? KAl3Si3O10(OH)2 + SiO2 --> Al2SiO5 + KAlSi3O8 + H2O
A) high temperature B) high pressure C) high grade D) hydrothermal